Webassembly with C++ Ubuntu

This post shows you how to create Webassembly in Ubuntu 10.08. I get 2 links one is https://medium.com/@cchaconsartori/introduction-to-webassembly-with-c-part-i-64bcfad7ecb4 and another is https://medium.com/@tdeniffel/pragmatic-compiling-from-c-to-webassembly-a-guide-a496cc5954b8. Unfortunately you need to combine these two to make it works for now. Whether it will continue to break in future then I cannot tell you. I tried this whole afternoon to just make it works. Hope you don’t need the whole afternoon.

After you have done installing Ubuntu. Don’t issue the follow command.

$ sudo apt update

till you run

$ sudo apt install build-essential cmake python git

The article is stating

$ apt install build-essential cmake python git

Bet what, it will give you error.

Follow you run this 5 commands.

$ git clone https://github.com/juj/emsdk.git

$ cd emsdk

$ ./emsdk install latest

$ ./emsdk activate latest

$ source ./emsdk_env.sh –build=Release

Create a hello.cpp as follow.

$ cat hello.cpp


int main() {

std::cout << “Hello World” << std::endl;

return 0;


Compile the code.

$ em++ hello.cpp -s WASM=1 -o hello.html

Run the code

$ emrun hello.html


About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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